Michal Puškár

Numerical simulation and experimental analysis of acoustic wave influences on brake mean effective pressure in thrust–ejector inlet pipe of combustion engine

This paper is focused on a numerical simulation and experimental analysis of acoustic wave influences on brake mean effective pressure in a thrust–ejector inlet pipe of a piston combustion engine. The experiment is based on a real racing motorbike, which is driven by a piston combustion engine, equipped with a newly developed and patented thrust–ejector inlet pipe. This new inlet pipe is able to eliminate problems concerning an insufficient charging of cylinder with a fresh mixture. The engine sucks the air by overpressure, which is directly related to increased performance and torque. The first part of this paper presents the analytical relations describing acoustic waves in an inlet pipe. The next part contains a numerical simulation performed by software Ansys CFX in order to obtain a detailed description of flowing air, which passes through the ejector into the air box. The experimental measurements were realised using the data–recording system EW&C.

Method for reduction of the NOX emissions in marine auxiliary diesel engine using the fuel mixtures containing biodiesel using HCCI combustion

The marine auxiliary diesel engines installed in the large transoceanic ships are used in order to generate the electricity but at the same time these engines are able to produce a significant amount of the harmful exhaust gas emissions. Therefore the International Maritime Organisation (IMO) concluded an agreement, which has to control generating of gaseous emissions in maritime transport. From this reason started to be used some of the alternative fuels in this branch. There was performed a study, which investigated emissions of the auxiliary marine diesel engine during application of the experimental fuels. The different testing fuels were created using the ratios 0%, 50%, 80% and 100% between the biodiesel and the ULSDF (Ultra Low Sulphur Diesel Fuel). The experimental measurements were performed at the different engine loading levels and various engine speeds in order to investigate an influence of the mixed fuels on the engine operational characteristics.

Analysis of Uncertainty of Tilt Measurement with Accelerometer

The paper deals with the analysis of uncertainty of tilt measurement using accelerometer. Low cost accelerometer based on the principle of heat array is used for tilt measurement. One chip microcontroller is used for data processing from accelerometer. The knowledge of uncertainty of measurement for this measuring chain is necessary for our application.

Design of experimental vehicle specified for competition Shell Eco-marathon 2017 according to principles of car body digitisation based on views in 2D using the intuitive tool Imagine&Shape CATIA V5

Shell Eco-marathon and Building of Experimental Vehicle.Intuitive Tool for Creation of Surface Model in CATIA V5.Design with Imagine&Shape.Rapid Prototyping.Aerodynamics analysis. Materialisation of every new great idea requires performing of many activities, including application of the latest CA-technologies. Nowadays the design process concerning the exterior and interior parts of a motorcar is unthinkable without utilisation of the CAD support. Although the primary impulses, new ideas or inspirations are arising in the minds of customers, businessmen and managers, the realisation process itself is always a serious task for the engineers in order to create a final shape, taking into consideration the customers requirements. The experimental vehicles represent a special category of the motorcars. Design of the experimental vehicles demands a specific approach with regard to the above-standard requirements concerning vehicle aerodynamics, reduced rolling resistances and low-level fuel consumption of the vehicle engine.

Principles of car body digitisation based on geometry extracted from views in 2D drawing documentation

Application of the computer aided design (CAD) systems reduced duration of innovation cycle in the area of new motorcar development from 8-10 years in the past to 4-6 years presently. Another consequence of the CAD implementation is a fact that some of simpler modifications of the car body shapes, i.e., the so-called facelifts, are applied already two or three years after the beginning of a new model production. With regard to a fact that the motorcar is a result of mutual cooperation between the designer and constructor, the designers ideas are impressed into the modelling material (clay) or they are presented on paper in the form of sketches. The next step is already up to technicians, i.e., they have to transform these ideas into the real 3D data fields in order to prepare tools for the production of the individual motorcar parts. This paper describes an example of exact modelling according to the drawing documentation.

Autonomous vehicle with internal combustion drive based on the homogeneous charge compression ignition technology

The actual dynamical development of the information technologies is also typical for the area of automotive industry. The autonomous control technology is moving the motorcars into the mobile robot category. The autonomous mobile robotic vehicles, together with new possibilities offered thanks to the mobility services, are improving not only comfort but also safety of transport. Nowadays, application of the homogeneous charge compression ignition technology represents a great progress made in the field of internal combustion drive, taking into consideration more and more rigorous emission standards. This article deals with principles and architecture of the autonomous control, with hybrid drive systems as well as it analyses advantages of the homogeneous charge compression ignition technology, taking into consideration the obtained experimental results.

Influence of Pipe Geometric Deviations on In-Pipe Machine Locomotion

The paper deals with the analysis of influence of pipe deviations on in-pipe machine locomotion. In-pipe machine locomotes inside a pipe using the friction difference principle of locomotion. Main task of the machine is inspection of inner pipe wall as the prevention of pipe crack and leaks of transported medium. Pipe systems have deviations of inner pipe wall, which are caused by production process and caused by using of pipe (deformations, sediments, changes from coupling of pipes etc.). These pipe deviations have direct influence on machine locomotion inside the pipe.

Actuation of Control System for Racing Engine Using Active Data Maps

The modern systems developed for a control of ignition and fuel injection in the racing piston combustion engines require a continuous supplementation of the input information, together with permanent monitoring and correction of these input data. Such operations are performed by means of specialized software, which is able to decode the maps of active data fields as well as to modify them afterwards in the framework of the required values. The correct editing of the data field enables a faster and more accurate distribution of the active values.

Analytical and Numerical Proposal for Designing Plastic Vessels

The article in question concerns the proposal of a pressure vessel for a water heater made of plastic materials. At present, new materials and technologies are coming to the fore where the product price, above all, plays an important role, taking into account the relevant physical and strength properties. The pressure vessels of larger volume (more than 10 litres) water heaters are only manufactured using steel materials under European Union conditions. The proposal considers the use of an alternative material, namely plastic. By optimising the proposal – by the use of plastic materials – it would be possible to achieve a financial economy, since plastic is a good thermal insulating material and does not require enamelling or the use of a cathode protection. There are plastics available on the market which meet the requirements of heat resistance and have a relatively high tensile strength. One of these proposed materials is Noryl GFN1630V which contains 30 % of glass fibre and was chosen as the optimal material. By making strength calculations in the ANSYS programme, water heater pressure vessels were proposed.